Once I got mine out past the wall paneling a little, I just pushed it to the left to have enough room to get in there. I was actually installing an automatic transfer switch in that rat's nest. It wasn't EZ but I got her done.
That when I used the expanding foam under the tub for reinforcement. I don't think that I could have gotten any styrofoam blocks in there but I thought about it.
sorta
.... for a few minutes.